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小菜蛾是我国蔬菜上的重要害虫。由于小菜蛾的抗性日益严重，使传统的防治方法，如化学防治、农业防治和生物防治难以有效地控制小菜蛾的为害。植物性杀虫剂含有多种对害虫有活性的成分，且作用靶标多，作用方式复杂，害虫不易产生抗药性。印楝、苦楝、黄杜鹃、胜红蓟等８０多种植物对小菜蛾具有较好的防治效果，是防治抗性小菜蛾的一种有发展前景的杀虫剂。
Plutella xylostella is an important pest on vegetables in our country. Due to the increasingly serious resistance of diamondback moth, the traditional methods of prevention and control, such as chemical control, agricultural control and biological control, can not effectively control the diamondback moth damage. Botanical insecticides contain a variety of active ingredients of the pests, and the role of many targets, the role of complex, pests and difficult to produce resistance. More than 80 kinds of plants, such as Neem, Melia, Rhododendron cuneatum and Thistle, have good control effects on Plutella xylostella and are promising insecticides for controlling Plutella xylostella.